DK-21 snaps in like the OEM. Rubber is thinner, but perfectly adequate. It only rates 4 stars. As someone pointed out, they're cheap enough and work well, and if you lose them it doesn't matter. The spirit level is a 5 star product. Made of grippy rubber and plastic, it looks like a camera body. It slides over the metal edges of the hot shoe mount, not under the edges. It is firmly attached to the rubber band. The bubble itself is small, but it's a small space. I usually lose these things and then they end up in oil or something.
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